travelping / ergw / 2527

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fix reading from socket error queue (#272)

A select info is generated whenever there is something to read from
the socket, in C terms `(POLLIN | POLLERR)`. There is no distinction
whether that is normal read or errqueue read (POLLERR).
This adds a heuristic to read the errqueue should we get no data from
a normal socket read.

6 of 8 new or added lines in 1 file covered. (75.0%)

4481 of 5722 relevant lines covered (78.31%)

8161.48 hits per line